Driving-belt.



P. DIEHL.

DRIVING BELT.

APPLICATION FILED IAN.22. i913.

Patented Oct. 24, 1916.

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PHILIP DIEI-IL, 0F ELIZABETH, NEW JERSEY, ASSIGNOR TO THE SINGER MANUFAC- TUBING COMPANY, A CORPORATION OF NEW JERSEY.

DRIVING-BELT.

Application filed January 22, 1913.

To all whom it may concern:

Be it known that I, PHILIP DIEHL, a citizen of the United States, residing at Ehzabeth, in the county of Union and State of New Jersey, have invented certain new and useful Improvements in Driving-Belts, of which the following is a specificatlon, reference being had therein to the accompanying drawings.

This invention relates to an improvement in driving belts for that class of transmls sion mechanism known as sprocket gearing, in which the belt is provided w th means to prevent its slipping upon the driving and driven pulleys which 1t embraces, thereby insuring the preservation of the relative timing of such pulleys and the mechanism operatively connected therewith. This class of mechanism is exemplified in the wellknown form of pin-pulley and aperturedbelt connection between the needle-actuating and loop-taker actuating shafts of a rotary hook sewing machine, as represented for instance in my United States Patent No.

862,240, of August 6, 1907, wherein the pulleys are provided each with two rows of radial pins affording sprocket-teeth entering the apertures of two parallel rows in a connecting leather belt.

In the type of sewing machines referred to, the size of the driving pin-pulley upon the upper main-shaft is limited by the width of the hollow bracket-arm affording a support and housing therefor, and the driven pin-pulley upon the loop-taker shaft, rotating at double or treble the speed of the main-shaft, must obviously be much smaller than the driving pulley and in inverse proportion to the relative speeds of the respec tive shafts. Hence, the connecting belt must be not only very flexible but its pin-apertures accurately spaced apart to prevent injury by imperfect register with the pins of the respective pulleys. The requirements are considerably increased for a belt of this kind when embodied in sewing machines of a more recent construction in which the needleactuatingand loop-taker shafts are turned in opposite directions so as to necessitate the twisting of the belt and the rubbing of the inner faces together in the crossed portions.

In the use of the expedient disclosed in my Specification of Letters Patent.

Patented llet. 2d, 1916.

Serial No. 743,439.

apertures and consequent destruction of the belt by the imperfect register of the pinapertures with the pins of the pulleys. Because of the scarcity of the right kind of leather, the Cost of such belts has also been excesslve for such an element of the mecha- IllSIIl.

The present invention therefore has for some of its objects to provide a belt which is thoroughly reliable in use, of moderate cost, and one capable of being twisted to adapt it for transmission of rotary motion from the driving to the driven shaft in the required direction.

To this end, and in its preferred embodiment, the driving belt of the present improvement comprises a laminated band or tape of textile material, such as linen or cotton, of the requisite length to form a series of two or more superposed convolutions with the ends of the plies secured upon those which they overlap by stitching or otherwise, as disclosed for instance in the United States patent to H. E. Smallbone, No. 826,899, dated July 24, 1906. The endless band thus provided is formed with a series of apertures arranged in one or more rows extending lengthwise thereof, and each aperture is entered by a reinforcing eyelet secured in position preferably by two diametrically extending prongs formed at one end thereof and partially overlying the outer face and arranged crosswise of the belt with their end portions thrust through the latter and clenched upon the inner face thereof. By this means the eyelets are secured to the belt for only a portion of their circumference and in such manner that the belt is free to bend relatively to the eyelets which are thus permitted to work slightly inwardly and outwardly through their respective apertures.

The eyelets, while reinforcing the soft yielding edges of the pin-apertures toqprevent distortion orenlargement by any imperfect V engagement with the pins and protecting the loose ends of the component threads of the fabrics from raveling or fraying, oflerthe usual metallic pulleys which it embraces and to cause no appreciable interference or resistance between the contacting portions of the belt when the latter is twisted.

In the accompanying drawings, Figure 1 is a side view and Fig. 2 an edge view of a pair'of pin-pulleys connected by a twisted belt embodying the present improvement. Fig. 3 is a perspective view, upon a larger scale, representing a portion of the belt in transverse section, and Fig. i is a perspective view of one of the eyelets with its fastening prongs in the condition which they assume when applied to the belt.

"The larger or driving pulley is shown provided with the hub l and rim orrface 2 having intermediate the edges a series of spaced conical radial pins 3 affording sprocket-teeth adapted to enter the pinapertures of the driving belt; and the driven 'p ul-l'ey, which is shown herein of one-half the size of the driving pulley, is similarly formed with the hub 4 and rim or face 5 provided with the conical radial pins 6 spaced apart 'circumferentially correspondingly with those of the driving pulley.

The driving belt is shown of laminated type and composed of a tape wound upon itself in a series of convolutions to produce the overlapped plies? 8 9 which, as represented in Fig. 3, may be secured together by means of lines of stitching 10 arranged par allel With-and near the opposite edges. It is obvious, however, that these several plies may be secured together by different means, or that the belt may be woven in a singleply endless band.

-As represented in the drawings, the belt is provided with a row of pin-apertures 11 extending around the'same intermediate the edges and spaced apart correspondingly with the 'pins 3 and 6 of the driving and driven pulleys. Each aperture 11 is entered by a metallic reinforcing eyelet 12 whose inner end is slightly flared and terminates substantially flush with the inner face of the belt and whose outer end is formed with a lateral flange 13Ihaving extended diametrically therefrom the prongs 14L bent at right angles intermediate the ends to produce the members 15 passing through the belt near the edges and having preferably the sharpened end portions 16 which are pressed in the inner face of the belt with their pointed extremities inturned as represented in Fig. 3.

As will be observed, the prongs 14 afford narrow fastening strips arranged transversely of the belt for maintaining the eyelets 12 loosely within their respective pinapertures, and produce little or no resistance to the abrupt bending of the belt around the smaller pulley. These prongs obviously serve to clamp the several plies of the belt together, and may obviously be employed for the purpose without the separate lines of stitching 10, as represented in Figs. 1 and 2 wherein the stitching is omitted.

From the foregoing description, it will be seen that the essential feature of the present invention is the application to the driving belt of the reinforcingeyelets secured thereto in such manner that the belt is adapted to bend readily at the pin-apertures inde pendently of the eyelets, the fastening for the latter being effective for only a portion of the circumference thereof. \Vhile it is considered preferable to employ fastening prongs arranged diametrically of the eyelets and transversely of the belt, so that the eyelet has unfa sten'ed portions at diametrically opposite points lengthwise of the belt, it is evident that other fastening means may be employed within the scope of the present improvement by which the same result may be produced, 71. e., that of retaining the eyelet in place while permitting the belt to bend freely relatively thereto at the pin-holes.

-Having thus set forth the nature of the invention, what I claim herein is l. A driving belt comprising in combination, a flexible endless band formed with a series of spaced apertures disposed lengthwise-thereof, and a series of reinforcing eyelets entering said apertures, and each secured to said band at diametrically spaced points along a line lying crosswise of said belt, and being free from attachment to said belt at all other points circumferentially of said eyelet, whereby the band is free to bend about a pulley independently of said eyelets.

V 2. A driving belt comprising a flexible endless band formed with a series of spaced apertures disposed lengthwise thereof, and a series of reinforcing eyelets each entering one of said apertures and formed with supporting prongs extending crosswise of the band and having portions piercing the band near its marginal edges.

3. A driving belt comprising in combination a flexible endless band formed with a series of spaced apertures disposed lengthwise thereof, and a series of reinforcing eyelets, each comprising a tubular portion entering an aperture and terminating substantially flush with the inner surface of name to this specification, in the presence of two subscrlbmg Witnesses.

PHILIP DIEHL.

said band, and securing means disposed Wholly in a relatively narrow zone extending crosswise of said belt and diametrically of an aperture, for holding each eyelet in position While permitting bending movements of the belt relatively to each eyelet.

In testimony whereof, I have signed my Witnesses:

W. P. STEWART, HENRY A. KORNEMANN, Jr.

Uopies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, .D. C. 

